A falling object travels a distance given by the formula d = 4t + 16t2, where t is measured in seconds and d is measured in feet. How long will it take for the object to travel 72 ft?

Q: 6. 18 8.

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.